✨ feat: 数据库基线与通用 DTO（WP-01 第 3、4 步）

- 通用 DTO：Money（最小货币单位整数）、CursorPage 泛型、9 个平台 ID Annotated 类型（前缀+UUIDv7/v4 正则，与 openapi 契约对齐）
- db 基础：naming_convention Base（pk_/uq_/ix_/fk_，AGENTS 8.6）+ async engine + 事务作用域 session
- 首批 6 张表 typed mapping：user/personal_domain/session/service_account/audit_event/outbox_event；Session ID 为 CSPRNG opaque；审计与 Outbox 不可变
- Alembic async 迁移（含表注释）；docker 起 hunjing-postgres 并 upgrade 验证：7 表、约束/索引命名全部符合约定
- 按 database-design skill 清单交叉检查：外键索引全覆盖（复合唯一最左前缀）、审计聚合时间线与 Outbox 投递扫描均为专用复合索引
- 集成测试 8 项（唯一约束、FK restrict/cascade、检查约束、同事务提交）连 PG 测试库运行；pytest 15 项、ruff、mypy strict 全绿

backend/alembic.ini

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+# A generic, single database configuration.
+
+[alembic]
+# path to migration scripts.
+# this is typically a path given in POSIX (e.g. forward slashes)
+# format, relative to the token %(here)s which refers to the location of this
+# ini file
+script_location = %(here)s/alembic
+
+# template used to generate migration file names; The default value is %%(rev)s_%%(slug)s
+# Uncomment the line below if you want the files to be prepended with date and time
+# see https://alembic.sqlalchemy.org/en/latest/tutorial.html#editing-the-ini-file
+# for all available tokens
+# file_template = %%(year)d_%%(month).2d_%%(day).2d_%%(hour).2d%%(minute).2d-%%(rev)s_%%(slug)s
+# Or organize into date-based subdirectories (requires recursive_version_locations = true)
+# file_template = %%(year)d/%%(month).2d/%%(day).2d_%%(hour).2d%%(minute).2d_%%(second).2d_%%(rev)s_%%(slug)s
+
+# sys.path path, will be prepended to sys.path if present.
+# defaults to the current working directory.  for multiple paths, the path separator
+# is defined by "path_separator" below.
+prepend_sys_path = .
+
+# timezone to use when rendering the date within the migration file
+# as well as the filename.
+# If specified, requires the tzdata library which can be installed by adding
+# `alembic[tz]` to the pip requirements.
+# string value is passed to ZoneInfo()
+# leave blank for localtime
+# timezone =
+
+# max length of characters to apply to the "slug" field
+# truncate_slug_length = 40
+
+# set to 'true' to run the environment during
+# the 'revision' command, regardless of autogenerate
+# revision_environment = false
+
+# set to 'true' to allow .pyc and .pyo files without
+# a source .py file to be detected as revisions in the
+# versions/ directory
+# sourceless = false
+
+# version location specification; This defaults
+# to <script_location>/versions.  When using multiple version
+# directories, initial revisions must be specified with --version-path.
+# The path separator used here should be the separator specified by "path_separator"
+# below.
+# version_locations = %(here)s/bar:%(here)s/bat:%(here)s/alembic/versions
+
+# path_separator; This indicates what character is used to split lists of file
+# paths, including version_locations and prepend_sys_path within configparser
+# files such as alembic.ini.
+# The default rendered in new alembic.ini files is "os", which uses os.pathsep
+# to provide os-dependent path splitting.
+#
+# Note that in order to support legacy alembic.ini files, this default does NOT
+# take place if path_separator is not present in alembic.ini.  If this
+# option is omitted entirely, fallback logic is as follows:
+#
+# 1. Parsing of the version_locations option falls back to using the legacy
+#    "version_path_separator" key, which if absent then falls back to the legacy
+#    behavior of splitting on spaces and/or commas.
+# 2. Parsing of the prepend_sys_path option falls back to the legacy
+#    behavior of splitting on spaces, commas, or colons.
+#
+# Valid values for path_separator are:
+#
+# path_separator = :
+# path_separator = ;
+# path_separator = space
+# path_separator = newline
+#
+# Use os.pathsep. Default configuration used for new projects.
+path_separator = os
+
+
+# set to 'true' to search source files recursively
+# in each "version_locations" directory
+# new in Alembic version 1.10
+# recursive_version_locations = false
+
+# the output encoding used when revision files
+# are written from script.py.mako
+# output_encoding = utf-8
+
+# database URL.  This is consumed by the user-maintained env.py script only.
+# other means of configuring database URLs may be customized within the env.py
+# file.
+sqlalchemy.url = driver://user:pass@localhost/dbname
+
+
+[post_write_hooks]
+# post_write_hooks defines scripts or Python functions that are run
+# on newly generated revision scripts.  See the documentation for further
+# detail and examples
+
+# format using "black" - use the console_scripts runner, against the "black" entrypoint
+# hooks = black
+# black.type = console_scripts
+# black.entrypoint = black
+# black.options = -l 79 REVISION_SCRIPT_FILENAME
+
+# lint with attempts to fix using "ruff" - use the module runner, against the "ruff" module
+# hooks = ruff
+# ruff.type = module
+# ruff.module = ruff
+# ruff.options = check --fix REVISION_SCRIPT_FILENAME
+
+# Alternatively, use the exec runner to execute a binary found on your PATH
+# hooks = ruff
+# ruff.type = exec
+# ruff.executable = ruff
+# ruff.options = check --fix REVISION_SCRIPT_FILENAME
+
+# Logging configuration.  This is also consumed by the user-maintained
+# env.py script only.
+[loggers]
+keys = root,sqlalchemy,alembic
+
+[handlers]
+keys = console
+
+[formatters]
+keys = generic
+
+[logger_root]
+level = WARNING
+handlers = console
+qualname =
+
+[logger_sqlalchemy]
+level = WARNING
+handlers =
+qualname = sqlalchemy.engine
+
+[logger_alembic]
+level = INFO
+handlers =
+qualname = alembic
+
+[handler_console]
+class = StreamHandler
+args = (sys.stderr,)
+level = NOTSET
+formatter = generic
+
+[formatter_generic]
+format = %(levelname)-5.5s [%(name)s] %(message)s
+datefmt = %H:%M:%S

backend/alembic/README

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+Generic single-database configuration with an async dbapi.

backend/alembic/env.py

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+import asyncio
+from logging.config import fileConfig
+
+from sqlalchemy import pool
+from sqlalchemy.engine import Connection
+from sqlalchemy.ext.asyncio import async_engine_from_config
+
+from alembic import context
+
+# this is the Alembic Config object, which provides
+# access to the values within the .ini file in use.
+config = context.config
+
+# Interpret the config file for Python logging.
+# This line sets up loggers basically.
+if config.config_file_name is not None:
+    fileConfig(config.config_file_name)
+
+# 模型元数据（autogenerate 真源）；连接串来自环境（统一 PostgreSQL，ADR-024）
+import os
+
+from app import models  # noqa: F401  确保模型注册到 metadata
+from app.core.config import get_settings
+from app.db.base import Base
+
+target_metadata = Base.metadata
+db_url = os.environ.get("DATABASE_URL", get_settings().database_url)
+config.set_main_option("sqlalchemy.url", db_url)
+
+# other values from the config, defined by the needs of env.py,
+# can be acquired:
+# my_important_option = config.get_main_option("my_important_option")
+# ... etc.
+
+
+def run_migrations_offline() -> None:
+    """Run migrations in 'offline' mode.
+
+    This configures the context with just a URL
+    and not an Engine, though an Engine is acceptable
+    here as well.  By skipping the Engine creation
+    we don't even need a DBAPI to be available.
+
+    Calls to context.execute() here emit the given string to the
+    script output.
+
+    """
+    url = config.get_main_option("sqlalchemy.url")
+    context.configure(
+        url=url,
+        target_metadata=target_metadata,
+        literal_binds=True,
+        dialect_opts={"paramstyle": "named"},
+    )
+
+    with context.begin_transaction():
+        context.run_migrations()
+
+
+def do_run_migrations(connection: Connection) -> None:
+    context.configure(connection=connection, target_metadata=target_metadata)
+
+    with context.begin_transaction():
+        context.run_migrations()
+
+
+async def run_async_migrations() -> None:
+    """In this scenario we need to create an Engine
+    and associate a connection with the context.
+
+    """
+
+    connectable = async_engine_from_config(
+        config.get_section(config.config_ini_section, {}),
+        prefix="sqlalchemy.",
+        poolclass=pool.NullPool,
+    )
+
+    async with connectable.connect() as connection:
+        await connection.run_sync(do_run_migrations)
+
+    await connectable.dispose()
+
+
+def run_migrations_online() -> None:
+    """Run migrations in 'online' mode."""
+
+    asyncio.run(run_async_migrations())
+
+
+if context.is_offline_mode():
+    run_migrations_offline()
+else:
+    run_migrations_online()

backend/alembic/script.py.mako

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+"""${message}
+
+Revision ID: ${up_revision}
+Revises: ${down_revision | comma,n}
+Create Date: ${create_date}
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+${imports if imports else ""}
+
+# revision identifiers, used by Alembic.
+revision: str = ${repr(up_revision)}
+down_revision: Union[str, Sequence[str], None] = ${repr(down_revision)}
+branch_labels: Union[str, Sequence[str], None] = ${repr(branch_labels)}
+depends_on: Union[str, Sequence[str], None] = ${repr(depends_on)}
+
+
+def upgrade() -> None:
+    """Upgrade schema."""
+    ${upgrades if upgrades else "pass"}
+
+
+def downgrade() -> None:
+    """Downgrade schema."""
+    ${downgrades if downgrades else "pass"}

backend/alembic/versions/e16a40566b45_初始基线_身份_会话_服务账号_审计与_outbox.py

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+"""初始基线：身份、会话、服务账号、审计与 Outbox
+
+Revision ID: e16a40566b45
+Revises: 
+Create Date: 2026-09-10 09:55:35.167917
+
+"""
+from collections.abc import Sequence
+
+import sqlalchemy as sa
+from sqlalchemy.dialects import postgresql
+
+from alembic import op
+
+# revision identifiers, used by Alembic.
+revision: str = 'e16a40566b45'
+down_revision: str | Sequence[str] | None = None
+branch_labels: str | Sequence[str] | None = None
+depends_on: str | Sequence[str] | None = None
+
+
+def upgrade() -> None:
+    """Upgrade schema."""
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.create_table('audit_event',
+    sa.Column('id', sa.String(), nullable=False),
+    sa.Column('occurred_at', sa.DateTime(timezone=True), server_default=sa.text('now()'), nullable=False),
+    sa.Column('actor_type', sa.String(), nullable=False),
+    sa.Column('actor_id', sa.String(), nullable=False),
+    sa.Column('action', sa.String(), nullable=False),
+    sa.Column('aggregate_type', sa.String(), nullable=False),
+    sa.Column('aggregate_id', sa.String(), nullable=False),
+    sa.Column('payload', postgresql.JSONB(astext_type=sa.Text()), nullable=True),
+    sa.Column('trace_id', sa.String(), nullable=True),
+    sa.PrimaryKeyConstraint('id', name=op.f('pk_audit_event'))
+    )
+    op.create_index('ix_audit_event_aggregate', 'audit_event', ['aggregate_type', 'aggregate_id', 'occurred_at'], unique=False)
+    op.create_index('ix_audit_event_occurred_at', 'audit_event', ['occurred_at'], unique=False)
+    op.create_table('outbox_event',
+    sa.Column('id', sa.String(), nullable=False),
+    sa.Column('occurred_at', sa.DateTime(timezone=True), server_default=sa.text('now()'), nullable=False),
+    sa.Column('aggregate_type', sa.String(), nullable=False),
+    sa.Column('aggregate_id', sa.String(), nullable=False),
+    sa.Column('event_type', sa.String(), nullable=False),
+    sa.Column('payload', postgresql.JSONB(astext_type=sa.Text()), nullable=False),
+    sa.Column('status', sa.String(), nullable=False),
+    sa.Column('attempts', sa.Integer(), nullable=False),
+    sa.Column('delivered_at', sa.DateTime(timezone=True), nullable=True),
+    sa.CheckConstraint("status IN ('pending', 'delivered', 'failed')", name=op.f('ck_outbox_event_status_values')),
+    sa.PrimaryKeyConstraint('id', name=op.f('pk_outbox_event'))
+    )
+    op.create_index('ix_outbox_event_aggregate', 'outbox_event', ['aggregate_type', 'aggregate_id'], unique=False)
+    op.create_index('ix_outbox_event_status_occurred', 'outbox_event', ['status', 'occurred_at'], unique=False)
+    op.create_table('user',
+    sa.Column('id', sa.String(), nullable=False),
+    sa.Column('email', sa.String(), nullable=False),
+    sa.Column('display_name', sa.String(), nullable=False),
+    sa.Column('created_at', sa.DateTime(timezone=True), server_default=sa.text('now()'), nullable=False),
+    sa.Column('updated_at', sa.DateTime(timezone=True), server_default=sa.text('now()'), nullable=False),
+    sa.PrimaryKeyConstraint('id', name=op.f('pk_user')),
+    sa.UniqueConstraint('email', name=op.f('uq_user_email'))
+    )
+    op.create_table('personal_domain',
+    sa.Column('id', sa.String(), nullable=False),
+    sa.Column('user_id', sa.String(), nullable=False),
+    sa.Column('name', sa.String(), nullable=False),
+    sa.Column('data_region', sa.String(), nullable=False),
+    sa.Column('created_at', sa.DateTime(timezone=True), server_default=sa.text('now()'), nullable=False),
+    sa.ForeignKeyConstraint(['user_id'], ['user.id'], name=op.f('fk_personal_domain_user'), ondelete='restrict'),
+    sa.PrimaryKeyConstraint('id', name=op.f('pk_personal_domain'))
+    )
+    op.create_index(op.f('ix_personal_domain_user_id'), 'personal_domain', ['user_id'], unique=False)
+    op.create_table('session',
+    sa.Column('id', sa.String(), nullable=False),
+    sa.Column('user_id', sa.String(), nullable=False),
+    sa.Column('expires_at', sa.DateTime(timezone=True), nullable=False),
+    sa.Column('created_at', sa.DateTime(timezone=True), server_default=sa.text('now()'), nullable=False),
+    sa.Column('revoked_at', sa.DateTime(timezone=True), nullable=True),
+    sa.ForeignKeyConstraint(['user_id'], ['user.id'], name=op.f('fk_session_user'), ondelete='cascade'),
+    sa.PrimaryKeyConstraint('id', name=op.f('pk_session'))
+    )
+    op.create_index(op.f('ix_session_expires_at'), 'session', ['expires_at'], unique=False)
+    op.create_index(op.f('ix_session_user_id'), 'session', ['user_id'], unique=False)
+    op.create_table('service_account',
+    sa.Column('id', sa.String(), nullable=False),
+    sa.Column('domain_id', sa.String(), nullable=False),
+    sa.Column('name', sa.String(), nullable=False),
+    sa.Column('key_prefix', sa.String(), nullable=False),
+    sa.Column('key_hash', sa.String(), nullable=False),
+    sa.Column('scopes', postgresql.JSONB(astext_type=sa.Text()), nullable=False),
+    sa.Column('created_at', sa.DateTime(timezone=True), server_default=sa.text('now()'), nullable=False),
+    sa.Column('revoked_at', sa.DateTime(timezone=True), nullable=True),
+    sa.ForeignKeyConstraint(['domain_id'], ['personal_domain.id'], name=op.f('fk_service_account_personal_domain'), ondelete='cascade'),
+    sa.PrimaryKeyConstraint('id', name=op.f('pk_service_account'))
+    )
+    op.create_index(op.f('ix_service_account_key_prefix'), 'service_account', ['key_prefix'], unique=False)
+    op.create_index('uq_service_account_domain_name', 'service_account', ['domain_id', 'name'], unique=True)
+    # ### end Alembic commands ###
+    op.execute("COMMENT ON TABLE \"user\" IS '用户（WP-01）：多凭证与账户根'")
+    op.execute("COMMENT ON TABLE personal_domain IS '个人数据域：数据归属与授权边界，绑定固定数据区域'")
+    op.execute("COMMENT ON TABLE session IS 'Web 会话：ID 为 CSPRNG opaque，仅存校验值'")
+    op.execute("COMMENT ON TABLE service_account IS '服务账号：API key 明文只显示一次，只存哈希与前缀'")
+    op.execute("COMMENT ON TABLE audit_event IS '不可变审计链：与权威状态、Outbox 同事务提交'")
+    op.execute("COMMENT ON TABLE outbox_event IS 'Transactional Outbox：已提交领域事实的可靠投递队列'")
+
+
+def downgrade() -> None:
+    """Downgrade schema."""
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_index('uq_service_account_domain_name', table_name='service_account')
+    op.drop_index(op.f('ix_service_account_key_prefix'), table_name='service_account')
+    op.drop_table('service_account')
+    op.drop_index(op.f('ix_session_user_id'), table_name='session')
+    op.drop_index(op.f('ix_session_expires_at'), table_name='session')
+    op.drop_table('session')
+    op.drop_index(op.f('ix_personal_domain_user_id'), table_name='personal_domain')
+    op.drop_table('personal_domain')
+    op.drop_table('user')
+    op.drop_index('ix_outbox_event_status_occurred', table_name='outbox_event')
+    op.drop_index('ix_outbox_event_aggregate', table_name='outbox_event')
+    op.drop_table('outbox_event')
+    op.drop_index('ix_audit_event_occurred_at', table_name='audit_event')
+    op.drop_index('ix_audit_event_aggregate', table_name='audit_event')
+    op.drop_table('audit_event')
+    # ### end Alembic commands ###

backend/app/core/dto.py

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+"""通用 DTO：与 openapi/openapi.yaml 契约对齐的 Pydantic 类型。
+
+对齐由 tests/test_dto_contract.py 用 bundled 契约校验关键字段；
+禁止在此复制会漂移的完整值集（以契约为准）。
+"""
+
+from typing import Annotated
+
+from pydantic import BaseModel, ConfigDict, Field
+
+
+def _id_pattern(prefix: str, version: int) -> str:
+    ver = "7" if version == 7 else "4"
+    tail = r"[0-9a-f]{12}-[0-9a-f]{4}-" + ver + r"[0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$"
+    return f"^{prefix}" + tail
+
+
+UserId = Annotated[str, Field(pattern=_id_pattern("user_", 7))]
+PersonalDomainId = Annotated[str, Field(pattern=_id_pattern("domain_", 7))]
+ConversationId = Annotated[str, Field(pattern=_id_pattern("conversation_", 7))]
+BranchId = Annotated[str, Field(pattern=_id_pattern("branch_", 7))]
+MessageId = Annotated[str, Field(pattern=_id_pattern("message_", 7))]
+ContentBlockId = Annotated[str, Field(pattern=_id_pattern("block_", 7))]
+RunId = Annotated[str, Field(pattern=_id_pattern("run_", 7))]
+TurnId = Annotated[str, Field(pattern=_id_pattern("turn_", 7))]
+RequestId = Annotated[str, Field(pattern=_id_pattern("request_", 4))]
+
+
+class Money(BaseModel):
+    """金额：最小货币单位整数 + ISO 4217 币种；禁止浮点（契约第 4 节）。"""
+
+    model_config = ConfigDict(extra="forbid")
+
+    amount_minor: int = Field(ge=0)
+    currency: str = Field(pattern=r"^[A-Z]{3}$")
+
+
+class CursorPage[T](BaseModel):
+    """opaque cursor 分页（契约第 4.1 节）；客户端不得解析 cursor。"""
+
+    data: list[T]
+    next_cursor: str | None
+    has_more: bool

backend/app/db/__init__.py

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+"""数据库层：基础、引擎与命名约定。"""

backend/app/db/base.py

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+"""数据库基础：命名约定、异步引擎与会话。
+
+索引/约束命名按 AGENTS.md 8.6（pk_/uk_/idx_/fk_ + 表名）；
+主库统一 PostgreSQL（ADR-024），不提供 SQLite 档。
+"""
+
+from collections.abc import AsyncIterator
+
+from sqlalchemy import MetaData
+from sqlalchemy.ext.asyncio import (
+    AsyncEngine,
+    AsyncSession,
+    async_sessionmaker,
+    create_async_engine,
+)
+from sqlalchemy.orm import DeclarativeBase
+
+from app.core.config import get_settings
+
+naming_convention = {
+    "ix": "ix_%(column_0_label)s",
+    "uq": "uq_%(table_name)s_%(column_0_name)s",
+    "ck": "ck_%(table_name)s_%(constraint_name)s",
+    "fk": "fk_%(table_name)s_%(referred_table_name)s",
+    "pk": "pk_%(table_name)s",
+}
+
+
+class Base(DeclarativeBase):
+    metadata = MetaData(naming_convention=naming_convention)
+
+
+def create_engine() -> AsyncEngine:
+    return create_async_engine(get_settings().database_url, pool_pre_ping=True)
+
+
+def create_session_factory(engine: AsyncEngine) -> async_sessionmaker[AsyncSession]:
+    return async_sessionmaker(engine, expire_on_commit=False)
+
+
+async def session_scope(
+    factory: async_sessionmaker[AsyncSession],
+) -> AsyncIterator[AsyncSession]:
+    """事务作用域：成功提交、异常回滚（权威状态与 Outbox 同事务，契约第 4.4 节）。"""
+    async with factory() as session:
+        try:
+            yield session
+            await session.commit()
+        except Exception:
+            await session.rollback()
+            raise

backend/app/models.py

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+"""首批领域模型：身份、会话、服务账号、审计与 Outbox（WP-01）。
+
+- 主键为带前缀的 UUIDv7 文本（ADR-015）；Session ID 为 CSPRNG opaque（秘密不用 UUID）。
+- 命名约定见 app/db/base.py（pk_/uq_/ix_/fk_，AGENTS.md 8.6）。
+- AuditEvent 与 OutboxEvent 不可变：无 updated_at，修正写新记录（契约第 4.4 节）。
+"""
+
+from datetime import datetime
+from typing import Any
+
+from sqlalchemy import CheckConstraint, DateTime, ForeignKey, Index, String, func
+from sqlalchemy.dialects.postgresql import JSONB
+from sqlalchemy.orm import Mapped, mapped_column
+
+from app.core.ids import new_id
+from app.db.base import Base
+
+
+class User(Base):
+    __tablename__ = "user"
+
+    id: Mapped[str] = mapped_column(String, primary_key=True, default=lambda: new_id("user_"))
+    email: Mapped[str] = mapped_column(String, nullable=False, unique=True)
+    display_name: Mapped[str] = mapped_column(String, nullable=False)
+    created_at: Mapped[datetime] = mapped_column(
+        DateTime(timezone=True), nullable=False, server_default=func.now()
+    )
+    updated_at: Mapped[datetime] = mapped_column(
+        DateTime(timezone=True), nullable=False, server_default=func.now(), onupdate=func.now()
+    )
+
+
+class PersonalDomain(Base):
+    __tablename__ = "personal_domain"
+
+    id: Mapped[str] = mapped_column(
+        String, primary_key=True, default=lambda: new_id("domain_")
+    )
+    user_id: Mapped[str] = mapped_column(
+        ForeignKey("user.id", ondelete="restrict"), nullable=False, index=True
+    )
+    name: Mapped[str] = mapped_column(String, nullable=False)
+    # 区域驻留（ADR-024 之前的数据驻留决策）：默认区域，迁移走正式协议
+    data_region: Mapped[str] = mapped_column(String, nullable=False, default="default")
+    created_at: Mapped[datetime] = mapped_column(
+        DateTime(timezone=True), nullable=False, server_default=func.now()
+    )
+
+
+class Session(Base):
+    """Web 会话：ID 为 CSPRNG opaque value，数据库只存校验值（ADR-015）。"""
+
+    __tablename__ = "session"
+
+    id: Mapped[str] = mapped_column(String, primary_key=True)
+    user_id: Mapped[str] = mapped_column(
+        ForeignKey("user.id", ondelete="cascade"), nullable=False, index=True
+    )
+    expires_at: Mapped[datetime] = mapped_column(
+        DateTime(timezone=True), nullable=False, index=True
+    )
+    created_at: Mapped[datetime] = mapped_column(
+        DateTime(timezone=True), nullable=False, server_default=func.now()
+    )
+    revoked_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True), nullable=True)
+
+
+class ServiceAccount(Base):
+    """自动化账号：API key 明文只显示一次，只保存哈希、前缀、scope 与撤销状态。"""
+
+    __tablename__ = "service_account"
+
+    id: Mapped[str] = mapped_column(
+        String, primary_key=True, default=lambda: new_id("service_account_")
+    )
+    domain_id: Mapped[str] = mapped_column(
+        ForeignKey("personal_domain.id", ondelete="cascade"), nullable=False
+    )
+    name: Mapped[str] = mapped_column(String, nullable=False)
+    key_prefix: Mapped[str] = mapped_column(String, nullable=False, index=True)
+    key_hash: Mapped[str] = mapped_column(String, nullable=False)
+    scopes: Mapped[list[str]] = mapped_column(JSONB, nullable=False, default=list)
+    created_at: Mapped[datetime] = mapped_column(
+        DateTime(timezone=True), nullable=False, server_default=func.now()
+    )
+    revoked_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True), nullable=True)
+
+    __table_args__ = (Index("uq_service_account_domain_name", "domain_id", "name", unique=True),)
+
+
+class AuditEvent(Base):
+    """不可变审计链：状态与 Outbox 在同一事务提交（契约第 4.4 节）。"""
+
+    __tablename__ = "audit_event"
+
+    id: Mapped[str] = mapped_column(String, primary_key=True, default=lambda: new_id("audit_"))
+    occurred_at: Mapped[datetime] = mapped_column(
+        DateTime(timezone=True), nullable=False, server_default=func.now()
+    )
+    actor_type: Mapped[str] = mapped_column(String, nullable=False)
+    actor_id: Mapped[str] = mapped_column(String, nullable=False)
+    action: Mapped[str] = mapped_column(String, nullable=False)
+    aggregate_type: Mapped[str] = mapped_column(String, nullable=False)
+    aggregate_id: Mapped[str] = mapped_column(String, nullable=False)
+    payload: Mapped[dict[str, Any] | None] = mapped_column(JSONB, nullable=True)
+    trace_id: Mapped[str | None] = mapped_column(String, nullable=True)
+
+    __table_args__ = (
+        # 聚合时间线是审计的主要查询路径（最左前缀覆盖聚合定位）
+        Index("ix_audit_event_aggregate", "aggregate_type", "aggregate_id", "occurred_at"),
+        Index("ix_audit_event_occurred_at", "occurred_at"),
+    )
+
+
+class OutboxEvent(Base):
+    """Transactional Outbox：已提交领域事实的可靠投递队列。"""
+
+    __tablename__ = "outbox_event"
+
+    id: Mapped[str] = mapped_column(String, primary_key=True, default=lambda: new_id("event_"))
+    occurred_at: Mapped[datetime] = mapped_column(
+        DateTime(timezone=True), nullable=False, server_default=func.now()
+    )
+    aggregate_type: Mapped[str] = mapped_column(String, nullable=False)
+    aggregate_id: Mapped[str] = mapped_column(String, nullable=False)
+    event_type: Mapped[str] = mapped_column(String, nullable=False)
+    payload: Mapped[dict[str, Any]] = mapped_column(JSONB, nullable=False)
+    status: Mapped[str] = mapped_column(String, nullable=False, default="pending")
+    attempts: Mapped[int] = mapped_column(nullable=False, default=0)
+    delivered_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True), nullable=True)
+
+    __table_args__ = (
+        CheckConstraint(
+            "status IN ('pending', 'delivered', 'failed')",
+            name="status_values",
+        ),
+        # 投递循环按状态+时间扫描待处理事件
+        Index("ix_outbox_event_status_occurred", "status", "occurred_at"),
+        Index("ix_outbox_event_aggregate", "aggregate_type", "aggregate_id"),
+    )

backend/pyproject.toml

@@ -12,6 +12,7 @@ dependencies = [
     "alembic>=1.14",
     "asyncpg>=0.30",
     "uuid-utils>=0.10",
+    "greenlet>=3.5.5",
 ]
 
 [dependency-groups]
@@ -37,6 +38,10 @@ target-version = "py312"
 [tool.ruff.lint]
 select = ["E", "F", "I", "UP", "B", "ASYNC"]
 
+[tool.ruff.lint.per-file-ignores]
+"alembic/*" = ["E402"]
+"alembic/versions/*" = ["E501"]
+
 [tool.mypy]
 python_version = "3.12"
 strict = true

backend/tests/conftest.py

@@ -0,0 +1,26 @@
+"""pytest 夹具：统一连接 PostgreSQL 测试库（ADR-024，不用 SQLite 替代）。"""
+
+import os
+
+import pytest
+from sqlalchemy.ext.asyncio import AsyncSession, async_sessionmaker, create_async_engine
+
+from app import models  # noqa: F401  注册模型
+from app.db.base import Base
+
+TEST_DATABASE_URL = os.environ.get(
+    "TEST_DATABASE_URL",
+    "postgresql+asyncpg://hunjing:hunjing_dev_password@127.0.0.1:5432/hunjing_test",
+)
+
+
+@pytest.fixture
+async def db() -> async_sessionmaker[AsyncSession]:
+    """每个测试重建 schema：隔离且可重复。"""
+    engine = create_async_engine(TEST_DATABASE_URL)
+    async with engine.begin() as conn:
+        await conn.run_sync(Base.metadata.drop_all)
+        await conn.run_sync(Base.metadata.create_all)
+    factory = async_sessionmaker(engine, expire_on_commit=False)
+    yield factory
+    await engine.dispose()

backend/tests/test_models.py

@@ -0,0 +1,143 @@
+"""首批模型的集成测试：CRUD、约束与外键行为（运行于 PostgreSQL）。"""
+
+from datetime import UTC, datetime, timedelta
+
+import pytest
+from sqlalchemy import select
+from sqlalchemy.exc import IntegrityError
+from sqlalchemy.ext.asyncio import AsyncSession, async_sessionmaker
+
+from app.core.ids import new_id
+from app.models import AuditEvent, OutboxEvent, PersonalDomain, ServiceAccount, Session, User
+
+
+async def _make_user(db: async_sessionmaker[AsyncSession], email: str = "a@example.com") -> User:
+    async with db() as session:
+        user = User(email=email, display_name="测试用户")
+        session.add(user)
+        await session.commit()
+        await session.refresh(user)
+        return user
+
+
+async def test_user_crud_and_id_prefix(db: async_sessionmaker[AsyncSession]) -> None:
+    user = await _make_user(db)
+    assert user.id.startswith("user_")
+    async with db() as session:
+        loaded = await session.get(User, user.id)
+        assert loaded is not None
+        assert loaded.email == "a@example.com"
+        assert loaded.created_at.tzinfo is not None  # aware UTC
+
+
+async def test_duplicate_email_rejected_by_unique(db: async_sessionmaker[AsyncSession]) -> None:
+    await _make_user(db)
+    async with db() as session:
+        session.add(User(email="a@example.com", display_name="重复"))
+        with pytest.raises(IntegrityError):
+            await session.commit()
+
+
+async def test_personal_domain_requires_user(db: async_sessionmaker[AsyncSession]) -> None:
+    async with db() as session:
+        session.add(PersonalDomain(user_id=new_id("user_"), name="镜域"))
+        with pytest.raises(IntegrityError):
+            await session.commit()
+
+
+async def test_delete_user_restricted_by_domain(db: async_sessionmaker[AsyncSession]) -> None:
+    user = await _make_user(db)
+    async with db() as session:
+        session.add(PersonalDomain(user_id=user.id, name="镜域"))
+        await session.commit()
+    async with db() as session:
+        loaded = await session.get(User, user.id)
+        assert loaded is not None
+        await session.delete(loaded)
+        with pytest.raises(IntegrityError):
+            await session.commit()
+
+
+async def test_session_cascades_with_user(db: async_sessionmaker[AsyncSession]) -> None:
+    user = await _make_user(db)
+    async with db() as session:
+        session.add(
+            Session(
+                id="opaque-session-token",
+                user_id=user.id,
+                expires_at=datetime.now(UTC) + timedelta(days=7),
+            )
+        )
+        await session.commit()
+    async with db() as session:
+        loaded = await session.get(User, user.id)
+        assert loaded is not None
+        await session.delete(loaded)
+        await session.commit()
+    async with db() as session:
+        assert (await session.scalars(select(Session))).all() == []
+
+
+async def test_service_account_unique_domain_name(db: async_sessionmaker[AsyncSession]) -> None:
+    user = await _make_user(db)
+    async with db() as session:
+        domain = PersonalDomain(user_id=user.id, name="镜域")
+        session.add(domain)
+        await session.commit()
+        await session.refresh(domain)
+    async with db() as session:
+        session.add(
+            ServiceAccount(
+                domain_id=domain.id, name="ci", key_prefix="hjk_ci", key_hash="sha256:..."
+            )
+        )
+        await session.commit()
+        session.add(
+            ServiceAccount(
+                domain_id=domain.id, name="ci", key_prefix="hjk_ci2", key_hash="sha256:..."
+            )
+        )
+        with pytest.raises(IntegrityError):
+            await session.commit()
+
+
+async def test_outbox_status_check_constraint(db: async_sessionmaker[AsyncSession]) -> None:
+    async with db() as session:
+        session.add(
+            OutboxEvent(
+                aggregate_type="user",
+                aggregate_id=new_id("user_"),
+                event_type="user.created",
+                payload={},
+                status="bogus",
+            )
+        )
+        with pytest.raises(IntegrityError):
+            await session.commit()
+
+
+async def test_audit_and_outbox_same_transaction(db: async_sessionmaker[AsyncSession]) -> None:
+    """契约第 4.4 节：权威状态、AuditEvent 与 OutboxEvent 同事务提交。"""
+    async with db() as session:
+        user = User(email="tx@example.com", display_name="事务")
+        session.add(user)
+        await session.flush()  # 取得 user.id，事务尚未提交
+        session.add(
+            AuditEvent(
+                actor_type="system",
+                actor_id="system",
+                action="user.created",
+                aggregate_type="user",
+                aggregate_id=user.id,
+            )
+        )
+        session.add(
+            OutboxEvent(
+                aggregate_type="user",
+                aggregate_id=user.id,
+                event_type="user.created",
+                payload={"user_id": user.id},
+            )
+        )
+        await session.commit()
+        assert (await session.scalars(select(OutboxEvent))).one().status == "pending"

backend/uv.lock

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